I wouldn't sail this ship if I were you
1. The original sandwich, as requested by John Montagu, fourth Earl of Sandwich, to eat whilst playing cards. It is unknown whether he ever needed to prop up his card table but, had he needed to, I think we can all agree that a sandwich would be one option for doing so.
2. The beard of Grigori Yefimovich Rasputin. May need to be folded over a little, depending on how wobbly your table is. If Rasputin is still attached, you might need to stop him moving somehow. For these reasons, we cannot fully recommend this option.
3. The US Declaration of Independence. May also need a bit of folding.
4. Lady Gaga’s meat dress. If you are eating near cats or dogs, this may be a bad option. However, having a table wedge that is a bit squishy may be of use if you are on a cobbled or otherwise lumpy surface.
5. The original woodblock for Hokusai’s The Great Wave off Kanagawa. Suitable only if your table is really wobbly: for example if one of the legs has broken off, or you are trying to set it up on extremely uneven ground.
6. The dead sea scrolls. You may need to stack fragments to get a suitable height. However, the large number of fragments available means that you should be able to pad your table leg to a high degree of precision, if needed.
7. The subcritical plutonium mass commonly known as the Demon Core. Obviously this does make actually using your table a little hazardous, not to mention the difficulties involved in wedging the thing under the leg in the first place. But on the plus side, nobody is likely to approach your table to tip it over.
